@majal - im not sure why can't EA send it directly to you, this is written in their website: Migration Skills Assessment FAQs:
<b>If I have lost or not received a letter of recognition from Engineers Australia and require a letter for migration purposes, what should I do?</b>
Applicants requiring a new letter of recognition must apply in writing using the Admin Fee form, requesting a letter for migration purposes. This is necessary for Engineers Australia to do a records check. With the completed form you must provide:
•A Statutory Declaration, witnessed by a Justice of the Peace or equivalent, describing why a new letter is required.
•Payment of the AU$110.00 administrative fee which has included the Goods and Service Tax (GST) and details of your current mailing address. Please note that if you are a resident outside Australia, the GST does NOT apply, the fee is AU$100.00